1 How Do Compounds Form? Rob Green

2 Making Molecules Come to the front and get one kit per two students. Get a white board and marker. We will construct and draw the models.

3 Chemistry What are the 4 main signs of chemical change? Gas Light Heat Odor

4 Chemistry What are changes of state? What causes a substance to undergo a change of state?

5 Chemistry What happens when a chemical change occurs? If a substance is broken into pieces, why is this a physical change?

6 Chemistry What is an ionic bond? How is it formed? What is a covalent bond? How is it formed?

7 Chemistry Why do compounds form? What must occur for Na & Cl to bond? How stable is a N 2 molecule?

8 Chemistry 1. What type of compounds form salts? 2. What type of compounds form molecules? 3. Which conducts electricity? Explain.

9 Chemistry 1. What controls the chemistry of an atom?

10 Electron's Influence What are the number of electrons in the outer shell? What configuration does this resemble?

11 Chemistry 1. What does the Roman numeral tell you? 2. Which ion is written first? 3. How do you indicate multiple polyatomic ions?

12 Making Molecules Come to the front and get one kit per two students. Get a white board and marker. We will construct and draw the models.

13 Electron’s Influence Look at the following on your periodic table. Na. K. Mg. O. Cl. F.

14 Representing Electrons Lewis dot structures show the electrons involved in bonding.

15 Lewis Dot Structures Sodium has 1 electron. It usually will loose it. Leaving with a positive charge. Na Na +

16 Practice Look at the rest of the atoms draw their Lewis dot structures. KF MgCl O

17 Answers K = Mg = O = Cl = F =

18 How Do the Ions Form? What happens during an ionic bond? Look at the notes for. 1-3 electrons. 5-8 electrons. 4 electrons.

19 Where Do the Electrons Go? Electronegativity drives ionic bonds. Na & Cl Na + + Cl -.

20 Formulas Hydrogen and sulfur

21 Formulas Magnesium and fluorine

22 Formulas Hydrogen and oxygen

23 Formulas Calcium and oxygen

24 Formulas Sodium and phosphorus

25 Formulas & Polyatomic Ions Sodium and hydroxide

26 Formulas & Polyatomic Ions Potassium and sulfate

27 Formulas & Polyatomic Ions Magnesium and phosphate

28 Formulas & Polyatomic Ions Aluminum and carbonate